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I currently have a "Custom" Vibrolux Reverb which has the exact same transformers and circuit board as the '63 VVRI. It has a couple differences in the circuit mainly the absence of negative feedback, making the CVR really noisy. It is very popular among CVR owners to revert the circuit to VVRI specs, commonly called the "Moyer Mod".

In my case I have done the changes, actually I put a switch to add/remove the negative FB. The amp is about half as noisy as it was but still has a decent background noise. At least more that my original silverfaced amps.

So is you '63 VVRI dead quiet when you flip the standby switch, even with no guitar connected or does it hum ?

My Moyer Modded CVR is very quiet. I'd look into the tubes you are using and try to get NOS preamp tubes if possible. I find NOS RCA 12AT7's are great for the reverb. Tung Sol Reissue 12AX7's also sound good in the amp.

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